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Title: Herschel-PACS observation of the 10 Myr old T Tauri disk TW Hya Constraining the disk gas mass
Authors: Thi, W. -F ×
Mathews, G
Menard, F
Woitke, P
Meeus, G
Riviere-Marichalar, P
Pinte, C
Howard, C. D
Roberge, A
Sandell, G
Pascucci, I
Riaz, B
Grady, C. A
Dent, W. R. F
Kamp, I
Duchene, G
Augereau, J. -C
Pantin, E
Vandenbussche, Bart
Tilling, I
Williams, J. P
Eiroa, C
Barrado, D
Alacid, J. M
Andrews, S
Ardila, D. R
Aresu, G
Brittain, S
Ciardi, D. R
Danchi, W
Fedele, D
de Gregorio-Monsalvo, I
Heras, A
Huelamo, N
Krivov, A
Lebreton, J
Liseau, R
Martin-Zaidi, C
Mendigutia, I
Montesinos, B
Mora, A
Morales-Calderon, M
Nomura, H
Phillips, N
Podio, L
Poelman, D. R
Ramsay, S
Rice, K
Solano, E
Walker, H
White, G. J
Wright, G #
Issue Date: Jul-2010
Publisher: Edp sciences s a
Series Title: Astronomy & astrophysics vol:518 pages:1-6
Article number: L125
Abstract: Planets are formed in disks around young stars. With an age of similar to 10 Myr, TW Hya is one of the nearest T Tauri stars that is still surrounded by a relatively massive disk. In addition a large number of molecules has been found in the TW Hya disk, making TW Hya the perfect test case in a large survey of disks with Herschel-PACS to directly study their gaseous component. We aim to constrain the gas and dust mass of the circumstellar disk around TW Hya. We observed the fine-structure lines of [OI] and [CII] as part of the open-time large program GASPS. We complement this with continuum data and ground-based (12) CO 3-2 and (CO)-C-13 3-2 observations. We simultaneously model the continuum and the line fluxes with the 3D Monte-Carlo code MCFOST and the thermo-chemical code ProDiMo to derive the gas and dust masses. We detect the [OI] line at 63 mu m. The other lines that were observed, [OI] at 145 mu m and [CII] at 157 mu m, are not detected. No extended emission has been found. Preliminary modeling of the photometric and line data assuming [(CO)-C-12]/[(CO)-C-13] = 69 suggests a dust mass for grains with radius < 1 mm of similar to 1.9 x 10(-4) M-circle dot (total solid mass of 3 x 10(-3) M-circle dot) and a gas mass of (0.5-5) x 10(-3) M-circle dot. The gas-to-dust mass may be lower than the standard interstellar value of 100.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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